Person A stays, saying, "Drum bun" (good road). Person B replies, "Rămas bun" (good stay).
I think it is "farewell", I think you can say, "La revedere, si ramas bun" which is something like "Farewell until I see you again". (I am happy to be corrected).
Look up ^ | It says goodbye is La revedere, but when I put that in I get the wrong answer. That needs to be fixed.